The black earth is a kind of Alfisol, with a thick layer of humus, loose texture, high fertility, high porosity ratio, poor permeability and a high content of clay, which is suitable for cultivation.

• 摘要黑土是一种腐殖质层厚，质地松散，肥力很高，孔隙比较大而透水性差，粘粒含量高，适于耕作的淋溶土。